I am excited to announce our new publication in Structures. Our research presents an innovative SMA-based TMD system designed to reduce vibrations in CLT floors. In our previous studies, a low damping ratio in SMA posed a challenge. However, in this research, we utilised pre-straining to enlarge and adjust the damping ratio to an optimal level. Through experimental testing, we have successfully verified the effectiveness of this TMD system.

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Abstract:

Cross-laminated timber (CLT), recognised for its environmental benefits, faces challenges in its excessive human-induced vibration due to its lightweight nature. This research investigates the application of a tuned mass damper (TMD) for vibration control in CLT floor slabs, focusing on enhancing the structural performance of using this sustainable building material. The study introduces a solution by integrating Shape memory alloy (SMA) into TMD systems (SMA-TMD), utilising the properties of SMAs for effective self-centring and consistent damping, and it aims to incorporate pre-strained SMAs into TMDs to improve the damping performance of the system. Experimental testing and finite element simulations confirm that pre-straining SMA bars not only contribute to the self-centring but also considerably increase the equivalent viscous damping ratio of the SMA-TMD. Findings from the simulations demonstrate that the optimised SMA-TMD system can substantially reduce CLT floor vibration and accelerates the energy dissipation effect under human footfall loadings, overcoming one of the primary limitations of CLT in construction applications. This advancement supports the broader adoption of CLT as a sustainable building material by providing a viable solution for vibration control.

I have been appointed as the Associate Editor of journal Proceedings of the ICE – Engineering History and Heritage. This journal welcomes all papers that relate to the History and Heritage of Civil Engineering, which includes infrastructure and buildings. It aims to reflect the full broad scope of Civil Engineering in papers that increase the knowledge and understanding of civil engineers when designing and constructing their works. Examples of topics can be found here.

I warmly welcome you to submit your work to our journal!

I am excited to share our latest publication, titled “Long-Term Loading Effect on Vibration Performance of CLT Floors: An 896-Day Monitoring Study,” in Engineering Structures. The tests were conducted over three years, from 2020 to 2023. I look forward to engaging in insightful discussions about our findings!

Abstract

Timber, a viscoelastic material, undergoes deformation over time when exposed to sustained loads, a process known as creep. Its rising popularity as a construction material, especially for timber floors, is notable. However, the influence of creep on the dynamic characteristics of timber floors, such as their natural frequency and vibration response, is not well studied. This research focused on how long-term loading (creep) affects the vibration behaviours of a cross-laminated timber (CLT) floor. A full-scale CLT floor was constructed in a lab and subjected to long-term loading using sandbags. Over 896 days, the centroid point deflection and environmental conditions (temperature and relative humidity) were monitored. Human-induced vibration tests were carried out at the beginning, throughout, and at the end of this period. The vibration response, measured in terms of the Vibration Dose Value (VDV), was assessed at various stages of long-term loading. The findings showed a moderate positive correlation between the creep deflection and environmental conditions. The fundamental frequency slightly increased over time due to creep, and a general decrease in VDV was observed as the creep advanced.